Umbilical hernia refers to a condition in children where the umbilical ring does not close during development, causing a defect in the abdominal wall. This situation can be treated conservatively. Within half a year, the effects are generally good. You can choose a coin larger than the umbilical ring or cover it with a flat board, press it against the umbilical ring, and then use adhesive tape to fix it to prevent movement. Generally, most patients can heal on their own. If the diameter of the umbilical ring still exceeds 1.5 cm after two years old, it is advisable to actively accept surgical treatment. Moreover, the protrusion may not involve a defect in the abdominal wall but a potential weakness in the abdominal wall at the navel. Under conditions of increased abdominal pressure, there can be a protruding appearance at the navel. The biggest difference from an umbilical hernia might be that the umbilical protrusion might present a lump that does not completely disappear. In the case of an umbilical hernia, if the contents can be returned to the abdominal cavity, the hernia can disappear completely.